public LiveDesignTimeProperty(DesignTimeHost <T> host, DesignTimeProperty property, Expression <Func <TValue> > liveValueProperty)
: base(host, property)
{
PropertyObserver.For(host)
.Observe(liveValueProperty.GetMemberName(), (s, e) =>
{
this.host.RaisePropertyChanged(this);
});
this.liveValueProperty = liveValueProperty;
this.liveValueDelegate = this.liveValueProperty.Compile();
}
public AutocompleteViewModel()
{
this.Data = new ObservableCollection <Person>();
PropertyObserver.For(this)
.Observe(v => v.Choosen, (v, s) =>
{
var value = v.Choosen;
})
.Observe(v => v.UserText, (v, s) =>
{
if (this.UserText.Length >= 3)
{
this.Data.Clear();
var filtered = storage.Where(p => p.FullName.StartsWith(this.UserText, StringComparison.OrdinalIgnoreCase));
foreach (var item in filtered)
{
this.Data.Add(item);
}
}
});
}
/// <summary>
/// Monitors the specified properties.
/// </summary>
/// <typeparam name="TSource">The type of the source.</typeparam>
/// <param name="command">The command.</param>
/// <param name="source">The source.</param>
/// <param name="properties">The properties to monitor.</param>
/// <returns>The original command.</returns>
public static IDelegateCommand Observe <TSource>(this IDelegateCommand command, TSource source, params Expression <Func <TSource, Object> >[] properties)
where TSource : INotifyPropertyChanged
{
Ensure.That(properties).Named(() => properties).IsNotNull();
if (properties.Any())
{
var observer = PropertyObserver.For(source);
foreach (var prop in properties)
{
observer.Observe(prop);
}
command.AddMonitor(observer);
}
else
{
var observer = PropertyObserver.ForAllPropertiesOf(source);
command.AddMonitor(observer);
}
return(command);
}
public virtual IDelegateCommand CreateCommand(CommandData commandData)
{
var text = (commandData.Description == null) ?
String.Empty :
commandData.Description.DisplayText;
var command = ( DelegateCommand )DelegateCommand.Create(text);
command.SetData(commandData);
command.OnCanExecute(o =>
{
var data = command.GetData <CommandData>();
if (data.Fact != null)
{
return(data.Fact.Eval(o));
}
else if (data.BooleanFact != null)
{
var can = data.BooleanFact.FastGetter();
return(can);
}
return(true);
})
.OnExecute(o =>
{
var data = command.GetData <CommandData>();
if (data.HasParameter)
{
var prm = o;
if (o is IConvertible)
{
prm = Convert.ChangeType(o, data.ParameterType);
}
data.FastDelegate(data.DataContext, new[] { prm });
}
else
{
data.FastDelegate(data.DataContext, null);
}
});
if (commandData.KeyBindings != null)
{
commandData.KeyBindings
.ForEach(kb => command.AddKeyGesture(kb.Key, kb.Modifiers));
}
IMonitor monitor = null;
if (commandData.Fact != null)
{
monitor = commandData.Fact;
}
else if (commandData.BooleanFact != null)
{
monitor = PropertyObserver.For(( INotifyPropertyChanged )commandData.DataContext)
.Observe(commandData.BooleanFact.Name);
}
if (command != null && monitor != null)
{
command.AddMonitor(monitor);
commandData.Monitor = monitor;
}
return(command);
}
public ComplexGraphViewModel()
{
var observer = MementoObserver.Monitor(this.service);
this.UndoCommand = DelegateCommand.Create()
.OnCanExecute(o => this.service.CanUndo)
.OnExecute(o => this.service.Undo())
.AddMonitor(observer);
this.RedoCommand = DelegateCommand.Create()
.OnCanExecute(o => this.service.CanRedo)
.OnExecute(o => this.service.Redo())
.AddMonitor(observer);
this.CreateNewAddressCommand = DelegateCommand.Create()
.OnExecute(o =>
{
var address = this.Entity.Addresses.AddNew();
this.SelectedAddress = address;
});
this.DeleteAddressCommand = DelegateCommand.Create()
.OnCanExecute(o => this.SelectedAddress != null)
.OnExecute(o =>
{
this.SelectedAddress.Delete();
this.SelectedAddress = this.Entity.Addresses.FirstOrDefault();
})
.AddMonitor
(
PropertyObserver.For(this)
.Observe(v => v.SelectedAddress)
);
var person = new Person()
{
FirstName = "Mauro",
LastName = "Servienti"
};
person.Addresses.Add(new Address(person)
{
City = "Treviglio",
Number = "11",
Street = "Where I live",
ZipCode = "20100"
});
person.Addresses.Add(new Address(person)
{
City = "Daolasa",
Number = "2",
Street = "Pierino",
ZipCode = "20100"
});
var entity = new PersonViewModel();
entity.Initialize(person, false);
this.service.Attach(entity);
this.Entity = entity;
}
